Two Marks Questions with Answers

Two Marks Questions with Answers

Q.1 Give the different types of command words used in 8259A ?

Ans. : The command words of 8259A are classified in two groups

1. Initialization Command Words (ICWs)

2. Operation Command Words (OCWs)

Q.2 Give the operating modes of 8259A ?

Ans. :

a) Fully nested mode

b) End Of Interrupt (EOI)

c) Automatic rotation

d) Automatic EOI mode

e) Specific rotation

f) Special mask mode

g) Edge and level Triggered mode

h) Reading 8259 status

i) Poll command

j) Special fully nested mode

k) Buffered mode

l) Cascade mode.

Q.3    What is the cascaded mode of 8259 programmable interrupt controller ?

Ans. : The mode in which 8259s are interconnected to get multiple interrupt is called cascaded mode.

In cascade mode one 8259A is configured in Master mode and other should be configured in the Slave mode. The 8259A connected directly to the 8085 INTR pin is referred to as the master. The INT pins from other 8259As are connected to the IR inputs of the master 8259A. These cascaded 8259As are referred to as slave.

Q.4    What are the different ways to end the interrupt execution in 8259 programmable interrupt controller ? (Refer section 9.5)

Q.5    List the interrupt related signals of 8085 that are connected to 8259 IC. (Refer section 9.1)

Q.6 State the use of ISR and PR registers in 8259 PIC. (Refer section 9.3)

Q.7 What are the salient features of INTEL 8259 programmable interrupt controller ? (Refer section 9.2)

Q.8 What is the need for 8259 PIC ? (Refer section 9.1)

Q.9 What are the function of USART ? (Refer section 9.2)

Q.10 List some of the features of 8259 Programmable Interrupt controller. (Refer section 9.2)

University Questions with Answers (Long Answered Questions)

(Regulation 2008)

Dec.-11

Q.1 With a neat diagram, discuss the functional organization of a programmable interrupt controller.

(Refer section 9.3) [16]

Dec.-12

Q.2 List the major components of 8259 A interrupt controller and explain their functions.

(Refer section 9.3) [8]

(Regulation 2013)

Dec.-16

Q.3 Explain the working of 8259 with a neat block diagram.

(Refer section 9.3)

Dec.-18

Q.4 Explain the architecture of 8259.

(Refer section 9.3)

Q.5 How 8259 is interfaced with 808          5 or 8051?

(Refer section 9.7)

(Regulation 2017)

Dec.-19

Q.6 With a functional block diagram, briefly the  architecture of the 8259 programmable interrupt controller.

(Refer section 9.5)